Compensating head-gear for looms.



v- S. S. JACKSON. I GOMPENSATING HEAD GEAR FOR LOOMS.

APPLIOATION FILED JULY 20, 1909.

Patented Mar. 14, 1911.

Inventor's oqfitorney TlNTTED STATES PATENT UFFTCE;

SIMEON SCI-ICON JACKSON, OF READVILLE, MASSACHUSETTS.

COMPENSATING HEAID-GEAR FOR LOOMS.

To all whom it may concern:

Be it known that I, SIMEoN SOHOON J ACK- SON, a subject of Great Britain, residing at Readville, in the county of Norfolk, State of Massachusetts, have invented a certain new and useful Improvement in Compensating Head-Gear for Looms, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention has relation to the class of devices which variously are termed compensating head-gears, roll-tops, over and under motions, or top-rigging, they consisting in general, of arrangements of levers, sheaves, rolls, or other rockers, with which the respective harness-frames employed in a loom are connected, and being used in lieu of springs to act in conjunction with shedding tappets or cams in the production of the successive sheds in the warp-threads.

The invention consists in novel and improved devices of the said class, especially contrived for employment in effecting those kinds of weaving necessitating the formation of sheds in which a greater number of harness-frames is at one shed-level than at the other, alternately with sheds in which the relative numbers of harness-frames at the different shed-levels are reversed. Thus, sometimes, the harnessframes are related in groups, and an entire group is required to occupy for certain shed-formations a position at either the upper level or the lower level, while another group is divided between the two levels, and for other shed-formations the first group is required to be divided between the two levels and the entire second group is required to occupy one or the other thereof. This, for instance, is the case on weaving two-ply fabric in a loom having a single shuttle which is made to pass alternately through a shed in the upper ply and through a shed in the lower ply, as for instance in weaving tubular fabric wherein the two plies are united along their edges, and also in weaving fabric having the two plies united along the other edge thereof.

One special object of the invention is to provide means for avoiding strain and breakage in case the shedding tappet or cams, the devices for transmitting motion therefrom to the harness-frames, the strapping, or the head-gear itself should not be proportioned just right, and in case the timing of the different tappets or cams should not be perfeet; so as thereby to render unnecessary an Specification of Letters Patent.

Application filed July 20, 1909.

Serial No. 508,610.

extremely exact setting and adjustment of the parts, including the tappets or cams, and obviate injury and trouble in case of accident or disarrangement of the working parts.

The invention is embodied in a movable carrier, a primary rocker in connection therewith, secondary rockers in opposed connection with the said primary rocker, each of the said secondary rockers having a group of harness-frames in opposed connection therewith, an actuating cam for the movable carrier producing taking-up motion by which an entire group of harness-frames is brought to the required level, and a giveaway motion permitting an entire group to occupy the opposite level, and a give-andtake spring which renders the compensating action yielding.

The invention is shown embodied for use in weaving tubular fabric comprising an upper ply and a lower ply, with the two plies united to each other at both edges of the web in the loom.

Figure 1 of the drawings shows in front elevation the harness-frames, shedding-tappets or cams, etc., employed for weaving the tubular fabric referred to, and a headgear embodying the invention. Fig. 2 is a side view thereof.

Four harness-frames are shown, respectively marked 1, 2, 3 and 4. The treadles which are connected in usual manner with the said harness-frames are marked, respectively, 1 2 3 and a and the sheddingtappets or cams are marked respectively 1 2 3", 4: The said tappets or cams are of the shapes and relative arrangement usually employed for tubular weaving. They are fixed upon jackshaft 5, the latter being driven from the crank-shaft 6 of the loom by spur-gears 5 6*, at the rate of one rotation of the jackshaft for two rotations of the cam-shaft. Strapping 7, 7 7', 7, eX- tends upward from the top bars of the harness-frames, and passes partly around the supporting sheaves 8, 8, to the head-gear.

The movable carrier of the head-gear is marked 9, the primary rocker which is pivoted thereon is marked 10, and 11, 11 are the secondary rockers which are pivoted upon the primary rocker. The said movable carrier is shown in the form of a bell-crank, which is hung upon the pivot 12 upon the arch 13 of the loom-frame. The primary rocker is lever-shaped. The secondary car- Patented Mar. 14:, 1911. i

T ter of the said secondary rocker 11, and made fast thereto. Thus, the two harness-frames 1 and 2' are in opposed connection with the said rocker 11', so that if either'of the said harness-frames '1 and2 is depressed by the action of its tappet or cam whilet-he other thereof is left free'to assume an elevated position, the unwinding of the strapping connectedwith the frame that is depressed turns the rocker part way so as to wind upon it the strapping of the other frame, thereby raising the latter. The harness-frames 3 and 4 are utilized for controlling the warpthreads of the other ply of the fabric,-and

' constitute a second group.

The strapping 7 of harness-frame 3 is wound partly around the portion of smaller diameter of secondaryrocker 11 and made fastthereto, andthat, .7", of harness-frame 4 is wound in the opposite direction partly around the portion of larger diameter of said rocker 11 and 'made'fast thereto. Thus the two harness-frames 3 and 4 are in opposed connection with the said rocker 11, so as to cause'them to act in the manner already explained .in treating of harnessframes 1 and 2, in case either 3 or 4 is depressed while the other'thereof is free to assume an elevated position.

The secondary rockers 11 and 11 respeci tively are pivoted upon'the primary rocker 10 at opposite sides of the pivot by which rocker 10 is mounted upon the carrier 9. Consequently, the said secondary rockers are in" opposed connection with the primary rocker. .As a result, pull transmitted through the "strapping of either group of the harnesseframes, as the respectiveframes of such group, are depressed by the action of the shedding tappets or cams, will act to T tilt the primary'rocker upon its pivot in the -direction to take up slack in the strapping of the harness-frames of the other group. Thereby a balancingaction is secured.

The shedding tappets or cams shown in the drawings are arranged to operate the harness-frames in the following order :No. 2 down and Nos. 1, 3 and 4 up, as in the drawings; 1, 2, and 3 .down and 4 up; 1

down and 2,3, and 4 up; 1, 2 and 4 down and "1 -3 up. In the case of shed-formations 1 "and 3, the depression of one of the harness- -frames of the first group is insufficient to take up the slack of the strapping sufiiciently t 'raise the other frame of such group and both frames o f the second group completely to the required upper level. Consequently a supplemental taking-up action is required fbr the purpose of pulling up the strapping and thereby further raising the said harnessframes until their treadles 1 3, and 4 have taken firm bearing against their actuating tappets or cams 1", 3 4". In the case of shed-formations 2 and 4 the simultaneous depression of both harness-frames of the first group and one of the harness-frames of the second group calls for more letting-down of the strapping than is permitted by the rise of one harness-frame of the second group. Consequently, a give-away action is required for the purpose of supplying an amount of slack suflicient to permit the depression of threeharness-frames to the lower level. To secure these taking-up and give-away actions, an actuating cam is provided, having connections between the same and the movable carrier through which it transmits to the latter-at the proper times movements by which the'rockers are shifted bodily in one direction to effect the said supplemental taking-up and in the reverse direction to effect the giving-away. Thus, at 14 .is a swiveling block which is hung by the pivot-pin 15 upon one arm of. the carrier 9, and 16 is a rod passing through holes in. said block, said rod having a collar 17 fastened thereon below the block and being surrounded above a the block by an expanding cushioning spring 18- thatis confined between the block and adjustablenuts 19 which are applied to the threaded top portion of the rod. The lower end of the rod is connected with a treadle 20 which is engaged by a cam 21 fixed upon the cam-shaft 6. c When the cam presses against the said treadle, the required takingup action is produced. When the said pressure is relieved, the give-away action is permitted to occur. v The cushioning spring 18 is of very great practical importance. It yields to avoid strain and breakage in case the parts should not be proportioned just right, and in case the timing of the shedding tappets or cams and cam 21 should not be perfect. It renders an extremely exact setting and adjustment of the parts unnecessary, and obviates injuryand trouble in case of accident or disarrangement of the working parts.

What is claimed as-the invention is 1. In a compensating head-gear for looms,

.the combination with harness-frames, and

shed-forming tappets or cams actuating said harness-frames, of a movable carrier, aprimary rocker in connection with said carrier and supported thereby, secondary rockers in opposed direct connection with said primary rocker, each secondary rocker having a group of harness-frames in opposed connection therewith, an actuating cam for the movable carrier producing taking-up, and a give-and-take spring which renders the compensating action yielding.

2. In a compensating headgear for looms, the combination with harness-frames, and shed-forming tappets or cams actuating said harness-frames, of a movable carrier, a primary rocker in connection with said carrier, secondary rockers in opposed connection with the said primary rocker, each secondary rocker having a group of harness-frames in opposed connection therewith, an actuating cam, and motion-transmitting devices be-- tween such cam and the carrier comprising a rod, a swivel hung to the carrier and through which the rod passes and a cushioning spring in connection with the rod acting against the swivel.

3. In a compensating head-gear for looms,

the combination with harness-frames, and shed-forming tappets or cams actuating said harness-frames, of a movable carrier, a primary rocker in connection with said carrier, secondary rockers in opposed connection with the said primary rocker, each having a group of harness-frames in opposed connection therewith, an actuating cam, a lever actuated by the said cam, a rod connected with the said lever, and a swivel hung to the said carrier and through which the rod transmits motion to the carrier.

In testimony whereof I afiix my signature in presence of two witnesses.

SIMEON SOIIOON J AGKSON.

Witnesses:

CHAS. F. RANDALL, EDITH J. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

